v3.26.1
Fees and Expenses - Prospectus Summary
Nov. 30, 2025
USD ($)
Lord Abbett Multi-Asset Balanced Opportunity Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. More information about these and other discounts is available from your financial intermediary and in “Sales Charge Reductions and Waivers” on page 292 of the prospectus, Appendix A to the prospectus, titled “Intermediary-Specific Sales Charge Reductions and Waivers,” and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 9-1 of Part II of the statement of additional information (“SAI”).
Expense Breakpoint Discounts [Text] You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds.
Expense Breakpoint, Minimum Investment Required [Amount] $ 100,000
Shareholder Fees Caption [Optional Text] Shareholder Fees (Fees paid directly from your investment)
Shareholder Fees [Table]
Shareholder Fees - Prospectus Summary - Lord Abbett Multi-Asset Balanced Opportunity Fund
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) [1] 2.25% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) [1] 0.00% [2] 1.00% [3] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
[1]

A shareholder transacting in share classes without a front-end sales charge may be required to pay a commission to its financial intermediary. Please contact your financial intermediary for more information about whether such a commission may apply to your transaction.
[2]

A contingent deferred sales charge (“CDSC”) of 1.00% may be assessed on certain Class A shares purchased or acquired without a sales charge if they are redeemed before the first day of the month in which the one-year anniversary of the purchase falls.
[3]

A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase.

Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Annual Fund Operating Expenses - Prospectus Summary - Lord Abbett Multi-Asset Balanced Opportunity Fund
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Management Fees (as a percentage of Assets) 0.10% 0.10% 0.10% 0.10% 0.10% 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%
Distribution and Service (12b-1) Fees 0.25% 1.00% 0.10% 0.00% 0.00% 0.45% 0.60% 0.50% 0.25% 0.00% 0.00%
Other Expenses (as a percentage of Assets): 0.15% 0.15% 0.15% 0.08% 0.15% 0.15% 0.15% 0.15% 0.15% 0.15% 0.08%
Acquired Fund Fees and Expenses [1] 0.70% 0.70% 0.70% 0.70% 0.70% 0.70% 0.70% 0.70% 0.70% 0.70% 0.70%
Expenses (as a percentage of Assets) 1.20% 1.95% 1.05% 0.88% 0.95% 1.40% 1.55% 1.45% 1.20% 0.95% 0.88%
[1]

Includes interest expense from certain underlying affiliated funds of 0.14%. Excluding interest expense of the applicable underlying affiliated funds, Total Annual Fund Operating Expenses are 1.06%, 1.81%, 0.91%, 0.74%, 0.81%, 1.26%, 1.41%, 1.31%, 1.06%, 0.81% and 0.74% for Class A, Class C, Class F, Class F3, Class I, Class P, Class R2, Class R3, Class R4, Class R5 and Class R6, respectively.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Class C shares automatically convert to Class A shares after eight years. The expense example for Class C shares for the ten-year period reflects the conversion to Class A shares. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] If Shares Are Redeemed
Expense Example, With Redemption [Table]
Expense Example - Prospectus Summary - Lord Abbett Multi-Asset Balanced Opportunity Fund - USD ($)
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Expense Example, with Redemption, 1 Year $ 345 $ 298 $ 107 $ 90 $ 97 $ 143 $ 158 $ 148 $ 122 $ 97 $ 90
Expense Example, with Redemption, 3 Years 597 612 334 281 303 443 490 459 381 303 281
Expense Example, with Redemption, 5 Years 870 1,052 579 488 525 766 845 792 660 525 488
Expense Example, with Redemption, 10 Years $ 1,647 $ 2,080 $ 1,283 $ 1,084 $ 1,166 $ 1,680 $ 1,845 $ 1,735 $ 1,455 $ 1,166 $ 1,084
Expense Example, No Redemption, By Year, Caption [Text] If Shares Are Not Redeemed
Expense Example, No Redemption [Table]
Expense Example, No Redemption - Prospectus Summary - Lord Abbett Multi-Asset Balanced Opportunity Fund - USD ($)
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Expense Example, No Redemption, 1 Year $ 345 $ 198 $ 107 $ 90 $ 97 $ 143 $ 158 $ 148 $ 122 $ 97 $ 90
Expense Example, No Redemption, 3 Years 597 612 334 281 303 443 490 459 381 303 281
Expense Example, No Redemption, 5 Years 870 1,052 579 488 525 766 845 792 660 525 488
Expense Example, No Redemption, 10 Years $ 1,647 $ 2,080 $ 1,283 $ 1,084 $ 1,166 $ 1,680 $ 1,845 $ 1,735 $ 1,455 $ 1,166 $ 1,084
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block] The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 31% of the average value of its portfolio.
Portfolio Turnover, Rate 31.00%
Lord Abbett Multi-Asset Income Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. More information about these and other discounts is available from your financial intermediary and in “Sales Charge Reductions and Waivers” on page 292 of the prospectus, Appendix A to the prospectus, titled “Intermediary-Specific Sales Charge Reductions and Waivers,” and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 9-1 of Part II of the statement of additional information (“SAI”).
Expense Breakpoint Discounts [Text] You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds.
Expense Breakpoint, Minimum Investment Required [Amount] $ 100,000
Shareholder Fees Caption [Optional Text] Shareholder Fees (Fees paid directly from your investment)
Shareholder Fees [Table]
Shareholder Fees - Prospectus Summary - Lord Abbett Multi-Asset Income Fund
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) [1] 2.25% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) [1] 0.00% [2] 1.00% [3] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
[1]

A shareholder transacting in share classes without a front-end sales charge may be required to pay a commission to its financial intermediary. Please contact your financial intermediary for more information about whether such a commission may apply to your transaction.
[2]

A contingent deferred sales charge (“CDSC”) of 1.00% may be assessed on certain Class A shares purchased or acquired without a sales charge if they are redeemed before the first day of the month in which the one-year anniversary of the purchase falls.
[3]

A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase.

Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Annual Fund Operating Expenses - Prospectus Summary - Lord Abbett Multi-Asset Income Fund
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Management Fees (as a percentage of Assets) 0.10% 0.10% 0.10% 0.10% 0.10% 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%
Distribution and Service (12b-1) Fees 0.25% 1.00% 0.10% 0.00% 0.00% 0.45% 0.60% 0.50% 0.25% 0.00% 0.00%
Other Expenses (as a percentage of Assets): 0.15% 0.15% 0.15% 0.09% 0.15% 0.15% 0.15% 0.15% 0.15% 0.15% 0.09%
Acquired Fund Fees and Expenses [1] 0.66% 0.66% 0.66% 0.66% 0.66% 0.66% 0.66% 0.66% 0.66% 0.66% 0.66%
Expenses (as a percentage of Assets) 1.16% 1.91% 1.01% 0.85% 0.91% 1.36% 1.51% 1.41% 1.16% 0.91% 0.85%
[1]

Includes interest expense from certain underlying affiliated funds of 0.16%. Excluding interest expense of the applicable underlying affiliated funds, Total Annual Fund Operating Expenses are 1.00%, 1.75%, 0.85%, 0.69%, 0.75%, 1.20%, 1.35%, 1.25%, 1.00%, 0.75% and 0.69% for Class A, Class C, Class F, Class F3, Class I, Class P, Class R2, Class R3, Class R4, Class R5 and Class R6, respectively.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Class C shares automatically convert to Class A shares after eight years. The expense example for Class C shares for the ten-year period reflects the conversion to Class A shares. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] If Shares Are Redeemed
Expense Example, With Redemption [Table]
Expense Example - Prospectus Summary - Lord Abbett Multi-Asset Income Fund - USD ($)
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Expense Example, with Redemption, 1 Year $ 341 $ 294 $ 103 $ 87 $ 93 $ 154 $ 144 $ 118 $ 93 $ 87
Expense Example, with Redemption, 3 Years 585 600 322 271 290 477 446 368 290 271
Expense Example, with Redemption, 5 Years 849 1,032 558 471 504 824 771 638 504 471
Expense Example, with Redemption, 10 Years $ 1,602 $ 2,038 $ 1,236 $ 1,049 $ 1,120 $ 1,802 $ 1,691 $ 1,409 $ 1,120 $ 1,049
Expense Example, No Redemption, By Year, Caption [Text] If Shares Are Not Redeemed
Expense Example, No Redemption [Table]
Expense Example, No Redemption - Prospectus Summary - Lord Abbett Multi-Asset Income Fund - USD ($)
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Expense Example, No Redemption, 1 Year $ 341 $ 194 $ 103 $ 87 $ 93 $ 154 $ 144 $ 118 $ 93 $ 87
Expense Example, No Redemption, 3 Years 585 600 322 271 290 477 446 368 290 271
Expense Example, No Redemption, 5 Years 849 1,032 558 471 504 824 771 638 504 471
Expense Example, No Redemption, 10 Years $ 1,602 $ 2,038 $ 1,236 $ 1,049 $ 1,120 $ 1,802 $ 1,691 $ 1,409 $ 1,120 $ 1,049
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block] The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 27% of the average value of its portfolio.
Portfolio Turnover, Rate 27.00%
Lord Abbett Convertible Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. More information about these and other discounts is available from your financial intermediary and in “Sales Charge Reductions and Waivers” on page 292 of the prospectus, Appendix A to the prospectus, titled “Intermediary-Specific Sales Charge Reductions and Waivers,” and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 9-1 of Part II of the statement of additional information (“SAI”).
Expense Breakpoint Discounts [Text] You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds.
Expense Breakpoint, Minimum Investment Required [Amount] $ 100,000
Shareholder Fees Caption [Optional Text] Shareholder Fees (Fees paid directly from your investment)
Shareholder Fees [Table]
Shareholder Fees - Prospectus Summary - Lord Abbett Convertible Fund
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) [1] 2.25% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) [1] 0.00% [2] 1.00% [3] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
[1]

A shareholder transacting in share classes without a front-end sales charge may be required to pay a commission to its financial intermediary. Please contact your financial intermediary for more information about whether such a commission may apply to your transaction.
[2]

A contingent deferred sales charge (“CDSC”) of 1.00% may be assessed on certain Class A shares purchased or acquired without a sales charge if they are redeemed before the first day of the month in which the one-year anniversary of the purchase falls.
[3]

A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase.

Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Annual Fund Operating Expenses - Prospectus Summary - Lord Abbett Convertible Fund
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Management Fees (as a percentage of Assets) 0.70% 0.70% 0.70% 0.70% 0.70% 0.70% 0.70% 0.70% 0.70% 0.70% 0.70%
Distribution and Service (12b-1) Fees 0.20% 0.81% [1] 0.10% 0.00% 0.00% 0.45% 0.60% 0.50% 0.25% 0.00% 0.00%
Other Expenses (as a percentage of Assets): 0.20% 0.20% 0.20% 0.12% 0.20% 0.20% 0.20% 0.20% 0.20% 0.20% 0.12%
Expenses (as a percentage of Assets) 1.10% 1.71% 1.00% 0.82% 0.90% 1.35% 1.50% 1.40% 1.15% 0.90% 0.82%
[1]

The 12b-1 fee the Fund will pay on Class C shares will be a blended rate calculated based on (i) 1.00% of the Fund’s average daily net assets attributable to shares held for less than one year and (ii) 0.80% of the Fund’s average daily net assets attributable to shares held for one year or more. All Class C shareholders of the Fund will bear 12b-1 fees at the same rate.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Class C shares automatically convert to Class A shares after eight years. The expense example for Class C shares for the ten-year period reflects the conversion to Class A shares. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] If Shares Are Redeemed
Expense Example, With Redemption [Table]
Expense Example - Prospectus Summary - Lord Abbett Convertible Fund - USD ($)
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Expense Example, with Redemption, 1 Year $ 335 $ 274 $ 102 $ 84 $ 92 $ 137 $ 153 $ 143 $ 117 $ 92 $ 84
Expense Example, with Redemption, 3 Years 567 539 318 262 287 428 474 443 365 287 262
Expense Example, with Redemption, 5 Years 818 928 552 455 498 739 818 766 633 498 455
Expense Example, with Redemption, 10 Years $ 1,535 $ 1,858 $ 1,225 $ 1,014 $ 1,108 $ 1,624 $ 1,791 $ 1,680 $ 1,398 $ 1,108 $ 1,014
Expense Example, No Redemption, By Year, Caption [Text] If Shares Are Not Redeemed
Expense Example, No Redemption [Table]
Expense Example, No Redemption - Prospectus Summary - Lord Abbett Convertible Fund - USD ($)
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Expense Example, No Redemption, 1 Year $ 335 $ 174 $ 102 $ 84 $ 92 $ 137 $ 153 $ 143 $ 117 $ 92 $ 84
Expense Example, No Redemption, 3 Years 567 539 318 262 287 428 474 443 365 287 262
Expense Example, No Redemption, 5 Years 818 928 552 455 498 739 818 766 633 498 455
Expense Example, No Redemption, 10 Years $ 1,535 $ 1,858 $ 1,225 $ 1,014 $ 1,108 $ 1,624 $ 1,791 $ 1,680 $ 1,398 $ 1,108 $ 1,014
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block] The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 151% of the average value of its portfolio.
Portfolio Turnover, Rate 151.00%
Lord Abbett Core Fixed Income Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. More information about these and other discounts is available from your financial intermediary and in “Sales Charge Reductions and Waivers” on page 292 of the prospectus, Appendix A to the prospectus, titled “Intermediary-Specific Sales Charge Reductions and Waivers,” and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 9-1 of Part II of the statement of additional information (“SAI”).
Expense Breakpoint Discounts [Text] You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds.
Expense Breakpoint, Minimum Investment Required [Amount] $ 100,000
Shareholder Fees Caption [Optional Text] Shareholder Fees (Fees paid directly from your investment)
Shareholder Fees [Table]
Shareholder Fees - Prospectus Summary - Lord Abbett Core Fixed Income Fund
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) [1] 2.25% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) [1] 0.00% [2] 1.00% [3] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
[1]

A shareholder transacting in share classes without a front-end sales charge may be required to pay a commission to its financial intermediary. Please contact your financial intermediary for more information about whether such a commission may apply to your transaction.
[2]

A contingent deferred sales charge (“CDSC”) of 1.00% may be assessed on certain Class A shares purchased or acquired without a sales charge if they are redeemed before the first day of the month in which the one-year anniversary of the purchase falls.
[3]

A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase.

Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Annual Fund Operating Expenses - Prospectus Summary - Lord Abbett Core Fixed Income Fund
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Management Fees (as a percentage of Assets) 0.21% 0.21% 0.21% 0.21% 0.21% 0.21% 0.21% 0.21% 0.21% 0.21% 0.21%
Distribution and Service (12b-1) Fees 0.20% 0.87% [1] 0.10% 0.00% 0.00% 0.45% 0.60% 0.50% 0.25% 0.00% 0.00%
Other Expenses (as a percentage of Assets): 0.14% 0.14% 0.14% 0.08% 0.14% 0.14% 0.14% 0.14% 0.14% 0.14% 0.08%
Expenses (as a percentage of Assets) 0.55% 1.22% 0.45% 0.29% 0.35% 0.80% 0.95% 0.85% 0.60% 0.35% 0.29%
Fee Waiver or Reimbursement 0.00% 0.00% 0.00% 0.00% (0.04%) [2] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Net Expenses (as a percentage of Assets) 0.55% 1.22% 0.45% 0.29% 0.31% 0.80% 0.95% 0.85% 0.60% 0.35% 0.29%
Fee Waiver or Reimbursement over Assets, Date of Termination         March 31, 2027            
[1]

The 12b-1 fee the Fund will pay on Class C shares will be a blended rate calculated based on (i) 1.00% of the Fund’s average daily net assets attributable to shares held for less than one year and (ii) 0.80% of the Fund’s average daily net assets attributable to shares held for one year or more. All Class C shareholders of the Fund will bear 12b-1 fees at the same rate.
[2]

For the period from April 1, 2026 through March 31, 2027, Lord, Abbett & Co. LLC (“Lord Abbett”) has contractually agreed to waive the Fund’s Class I shareholder servicing expenses at the annual rate of 0.04% of the Fund’s average daily net assets. This agreement may be terminated only by the Fund’s Board of Trustees.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same, giving effect to the fee waiver and expense reimbursement arrangement described above. Class C shares automatically convert to Class A shares after eight years. The expense example for Class C shares for the ten-year period reflects the conversion to Class A shares. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] If Shares Are Redeemed
Expense Example, With Redemption [Table]
Expense Example - Prospectus Summary - Lord Abbett Core Fixed Income Fund - USD ($)
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Expense Example, with Redemption, 1 Year $ 280 $ 224 $ 46 $ 30 $ 32 $ 82 $ 97 $ 87 $ 61 $ 36 $ 30
Expense Example, with Redemption, 3 Years 397 387 144 93 108 255 303 271 192 113 93
Expense Example, with Redemption, 5 Years 525 670 252 163 192 444 525 471 335 197 163
Expense Example, with Redemption, 10 Years $ 899 $ 1,291 $ 567 $ 368 $ 439 $ 990 $ 1,166 $ 1,049 $ 750 $ 443 $ 368
Expense Example, No Redemption, By Year, Caption [Text] If Shares Are Not Redeemed
Expense Example, No Redemption [Table]
Expense Example, No Redemption - Prospectus Summary - Lord Abbett Core Fixed Income Fund - USD ($)
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Expense Example, No Redemption, 1 Year $ 280 $ 124 $ 46 $ 30 $ 32 $ 82 $ 97 $ 87 $ 61 $ 36 $ 30
Expense Example, No Redemption, 3 Years 397 387 144 93 108 255 303 271 192 113 93
Expense Example, No Redemption, 5 Years 525 670 252 163 192 444 525 471 335 197 163
Expense Example, No Redemption, 10 Years $ 899 $ 1,291 $ 567 $ 368 $ 439 $ 990 $ 1,166 $ 1,049 $ 750 $ 443 $ 368
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block] The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 453% of the average value of its portfolio.
Portfolio Turnover, Rate 453.00%
Lord Abbett Core Plus Bond Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. More information about these and other discounts is available from your financial intermediary and in “Sales Charge Reductions and Waivers” on page 292 of the prospectus, Appendix A to the prospectus, titled “Intermediary-Specific Sales Charge Reductions and Waivers,” and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 9-1 of Part II of the statement of additional information (“SAI”).
Expense Breakpoint Discounts [Text] You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds.
Expense Breakpoint, Minimum Investment Required [Amount] $ 100,000
Shareholder Fees Caption [Optional Text] Shareholder Fees (Fees paid directly from your investment)
Shareholder Fees [Table]
Shareholder Fees - Prospectus Summary - Lord Abbett Core Plus Bond Fund
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) [1] 2.25% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) [1] 0.00% [2] 1.00% [3] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
[1]

A shareholder transacting in share classes without a front-end sales charge may be required to pay a commission to its financial intermediary. Please contact your financial intermediary for more information about whether such a commission may apply to your transaction.
[2]

A contingent deferred sales charge (“CDSC”) of 1.00% may be assessed on certain Class A shares purchased or acquired without a sales charge if they are redeemed before the first day of the month in which the one-year anniversary of the purchase falls.
[3]

A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase.

Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Annual Fund Operating Expenses - Prospectus Summary - Lord Abbett Core Plus Bond Fund
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Management Fees (as a percentage of Assets) 0.28% 0.28% 0.28% 0.28% 0.28% 0.28% 0.28% 0.28% 0.28% 0.28%
Distribution and Service (12b-1) Fees 0.20% 0.89% [1] 0.10% 0.00% 0.00% 0.60% 0.50% 0.25% 0.00% 0.00%
Other Expenses (as a percentage of Assets): 0.17% 0.17% 0.17% 0.08% 0.17% 0.17% 0.17% 0.17% 0.17% 0.08%
Expenses (as a percentage of Assets) 0.65% 1.34% 0.55% 0.36% 0.45% 1.05% 0.95% 0.70% 0.45% 0.36%
[1]

The 12b-1 fee the Fund will pay on Class C shares will be a blended rate calculated based on (i) 1.00% of the Fund’s average daily net assets attributable to shares held for less than one year and (ii) 0.80% of the Fund’s average daily net assets attributable to shares held for one year or more. All Class C shareholders of the Fund will bear 12b-1 fees at the same rate.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Class C shares automatically convert to Class A shares after eight years. The expense example for Class C shares for the ten-year period reflects the conversion to Class A shares. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] If Shares Are Redeemed
Expense Example, With Redemption [Table]
Expense Example - Prospectus Summary - Lord Abbett Core Plus Bond Fund - USD ($)
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Expense Example, with Redemption, 1 Year $ 290 $ 236 $ 56 $ 37 $ 46 $ 107 $ 97 $ 72 $ 46 $ 37
Expense Example, with Redemption, 3 Years 428 425 176 116 144 334 303 224 144 116
Expense Example, with Redemption, 5 Years 579 734 307 202 252 579 525 390 252 202
Expense Example, with Redemption, 10 Years $ 1,017 $ 1,423 $ 689 $ 456 $ 567 $ 1,283 $ 1,166 $ 871 $ 567 $ 456
Expense Example, No Redemption, By Year, Caption [Text] If Shares Are Not Redeemed
Expense Example, No Redemption [Table]
Expense Example, No Redemption - Prospectus Summary - Lord Abbett Core Plus Bond Fund - USD ($)
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Expense Example, No Redemption, 1 Year $ 290 $ 136 $ 56 $ 37 $ 46 $ 107 $ 97 $ 72 $ 46 $ 37
Expense Example, No Redemption, 3 Years 428 425 176 116 144 334 303 224 144 116
Expense Example, No Redemption, 5 Years 579 734 307 202 252 579 525 390 252 202
Expense Example, No Redemption, 10 Years $ 1,017 $ 1,423 $ 689 $ 456 $ 567 $ 1,283 $ 1,166 $ 871 $ 567 $ 456
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block] The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 448% of the average value of its portfolio.
Portfolio Turnover, Rate 448.00%
Lord Abbett Floating Rate Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. More information about these and other discounts is available from your financial intermediary and in “Sales Charge Reductions and Waivers” on page 292 of the prospectus, Appendix A to the prospectus, titled “Intermediary-Specific Sales Charge Reductions and Waivers,” and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 9-1 of Part II of the statement of additional information (“SAI”).
Expense Breakpoint Discounts [Text] You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds.
Expense Breakpoint, Minimum Investment Required [Amount] $ 100,000
Shareholder Fees Caption [Optional Text] Shareholder Fees (Fees paid directly from your investment)
Shareholder Fees [Table]
Shareholder Fees - Prospectus Summary - Lord Abbett Floating Rate Fund
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) [1] 2.25% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) [1] 0.00% [2] 1.00% [3] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
[1]

A shareholder transacting in share classes without a front-end sales charge may be required to pay a commission to its financial intermediary. Please contact your financial intermediary for more information about whether such a commission may apply to your transaction.
[2]

A contingent deferred sales charge (“CDSC”) of 1.00% may be assessed on certain Class A shares purchased or acquired without a sales charge if they are redeemed before the first day of the month in which the one-year anniversary of the purchase falls.
[3]

A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase.

Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Annual Fund Operating Expenses - Prospectus Summary - Lord Abbett Floating Rate Fund
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Management Fees (as a percentage of Assets) 0.46% 0.46% 0.46% 0.46% 0.46% 0.46% 0.46% 0.46% 0.46% 0.46%
Distribution and Service (12b-1) Fees 0.20% 0.82% [1] 0.10% 0.00% 0.00% 0.60% 0.50% 0.25% 0.00% 0.00%
Other Expenses (as a percentage of Assets): 0.15% 0.15% 0.15% 0.08% 0.15% 0.15% 0.15% 0.15% 0.15% 0.08%
Expenses (as a percentage of Assets) 0.81% 1.43% 0.71% 0.54% 0.61% 1.21% 1.11% 0.86% 0.61% 0.54%
[1]

The 12b-1 fee the Fund will pay on Class C shares will be a blended rate calculated based on (i) 1.00% of the Fund’s average daily net assets attributable to shares held for less than one year and (ii) 0.80% of the Fund’s average daily net assets attributable to shares held for one year or more. All Class C shareholders of the Fund will bear 12b-1 fees at the same rate.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Class C shares automatically convert to Class A shares after eight years. The expense example for Class C shares for the ten-year period reflects the conversion to Class A shares. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] If Shares Are Redeemed
Expense Example, With Redemption [Table]
Expense Example - Prospectus Summary - Lord Abbett Floating Rate Fund - USD ($)
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Expense Example, with Redemption, 1 Year $ 306 $ 246 $ 73 $ 55 $ 62 $ 123 $ 113 $ 88 $ 62 $ 55
Expense Example, with Redemption, 3 Years 478 452 227 173 195 384 353 274 195 173
Expense Example, with Redemption, 5 Years 665 782 395 302 340 665 612 477 340 302
Expense Example, with Redemption, 10 Years $ 1,204 $ 1,544 $ 883 $ 677 $ 762 $ 1,466 $ 1,352 $ 1,061 $ 762 $ 677
Expense Example, No Redemption, By Year, Caption [Text] If Shares Are Not Redeemed
Expense Example, No Redemption [Table]
Expense Example, No Redemption - Prospectus Summary - Lord Abbett Floating Rate Fund - USD ($)
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Expense Example, No Redemption, 1 Year $ 306 $ 146 $ 73 $ 55 $ 62 $ 123 $ 113 $ 88 $ 62 $ 55
Expense Example, No Redemption, 3 Years 478 452 227 173 195 384 353 274 195 173
Expense Example, No Redemption, 5 Years 665 782 395 302 340 665 612 477 340 302
Expense Example, No Redemption, 10 Years $ 1,204 $ 1,544 $ 883 $ 677 $ 762 $ 1,466 $ 1,352 $ 1,061 $ 762 $ 677
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block] The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 83% of the average value of its portfolio.
Portfolio Turnover, Rate 83.00%
Lord Abbett High Yield Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. More information about these and other discounts is available from your financial intermediary and in “Sales Charge Reductions and Waivers” on page 292 of the prospectus, Appendix A to the prospectus, titled “Intermediary-Specific Sales Charge Reductions and Waivers,” and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 9-1 of Part II of the statement of additional information (“SAI”).
Expense Breakpoint Discounts [Text] You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds.
Expense Breakpoint, Minimum Investment Required [Amount] $ 100,000
Shareholder Fees Caption [Optional Text] Shareholder Fees (Fees paid directly from your investment)
Shareholder Fees [Table]
Shareholder Fees - Prospectus Summary - Lord Abbett High Yield Fund
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) [1] 2.25% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) [1] 0.00% [2] 1.00% [3] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
[1]

A shareholder transacting in share classes without a front-end sales charge may be required to pay a commission to its financial intermediary. Please contact your financial intermediary for more information about whether such a commission may apply to your transaction.
[2]

A contingent deferred sales charge (“CDSC”) of 1.00% may be assessed on certain Class A shares purchased or acquired without a sales charge if they are redeemed before the first day of the month in which the one-year anniversary of the purchase falls.
[3]

A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase.

Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Annual Fund Operating Expenses - Prospectus Summary - Lord Abbett High Yield Fund
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Management Fees (as a percentage of Assets) 0.54% 0.54% 0.54% 0.54% 0.54% 0.54% 0.54% 0.54% 0.54% 0.54% 0.54%
Distribution and Service (12b-1) Fees 0.20% 0.83% [1] 0.10% 0.00% 0.00% 0.45% 0.60% 0.50% 0.25% 0.00% 0.00%
Other Expenses (as a percentage of Assets): 0.19% 0.19% 0.19% 0.09% 0.19% 0.19% 0.19% 0.19% 0.19% 0.19% 0.09%
Expenses (as a percentage of Assets) 0.93% 1.56% 0.83% 0.63% 0.73% 1.18% 1.33% 1.23% 0.98% 0.73% 0.63%
[1]

The 12b-1 fee the Fund will pay on Class C shares will be a blended rate calculated based on (i) 1.00% of the Fund’s average daily net assets attributable to shares held for less than one year and (ii) 0.80% of the Fund’s average daily net assets attributable to shares held for one year or more. All Class C shareholders of the Fund will bear 12b-1 fees at the same rate.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Class C shares automatically convert to Class A shares after eight years. The expense example for Class C shares for the ten-year period reflects the conversion to Class A shares. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] If Shares Are Redeemed
Expense Example, With Redemption [Table]
Expense Example - Prospectus Summary - Lord Abbett High Yield Fund - USD ($)
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Expense Example, with Redemption, 1 Year $ 318 $ 259 $ 85 $ 64 $ 75 $ 120 $ 135 $ 125 $ 100 $ 75 $ 64
Expense Example, with Redemption, 3 Years 515 493 265 202 233 375 421 390 312 233 202
Expense Example, with Redemption, 5 Years 728 850 460 351 406 649 729 676 542 406 351
Expense Example, with Redemption, 10 Years $ 1,342 $ 1,687 $ 1,025 $ 786 $ 906 $ 1,432 $ 1,601 $ 1,489 $ 1,201 $ 906 $ 786
Expense Example, No Redemption, By Year, Caption [Text] If Shares Are Not Redeemed
Expense Example, No Redemption [Table]
Expense Example, No Redemption - Prospectus Summary - Lord Abbett High Yield Fund - USD ($)
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Expense Example, No Redemption, 1 Year $ 318 $ 159 $ 85 $ 64 $ 75 $ 120 $ 135 $ 125 $ 100 $ 75 $ 64
Expense Example, No Redemption, 3 Years 515 493 265 202 233 375 421 390 312 233 202
Expense Example, No Redemption, 5 Years 728 850 460 351 406 649 729 676 542 406 351
Expense Example, No Redemption, 10 Years $ 1,342 $ 1,687 $ 1,025 $ 786 $ 906 $ 1,432 $ 1,601 $ 1,489 $ 1,201 $ 906 $ 786
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block] The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 79% of the average value of its portfolio.
Portfolio Turnover, Rate 79.00%
Lord Abbett Income Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. More information about these and other discounts is available from your financial intermediary and in “Sales Charge Reductions and Waivers” on page 292 of the prospectus, Appendix A to the prospectus, titled “Intermediary-Specific Sales Charge Reductions and Waivers,” and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 9-1 of Part II of the statement of additional information (“SAI”).
Expense Breakpoint Discounts [Text] You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds.
Expense Breakpoint, Minimum Investment Required [Amount] $ 100,000
Shareholder Fees Caption [Optional Text] Shareholder Fees (Fees paid directly from your investment)
Shareholder Fees [Table]
Shareholder Fees - Prospectus Summary - Lord Abbett Income Fund
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) [1] 2.25% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) [1] 0.00% [2] 1.00% [3] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
[1]

A shareholder transacting in share classes without a front-end sales charge may be required to pay a commission to its financial intermediary. Please contact your financial intermediary for more information about whether such a commission may apply to your transaction.
[2]

A contingent deferred sales charge (“CDSC”) of 1.00% may be assessed on certain Class A shares purchased or acquired without a sales charge if they are redeemed before the first day of the month in which the one-year anniversary of the purchase falls.
[3]

A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase.

Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Annual Fund Operating Expenses - Prospectus Summary - Lord Abbett Income Fund
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Management Fees (as a percentage of Assets) 0.37% 0.37% 0.37% 0.37% 0.37% 0.37% 0.37% 0.37% 0.37% 0.37% 0.37%
Distribution and Service (12b-1) Fees 0.20% 0.86% [1] 0.10% 0.00% 0.00% 0.45% 0.60% 0.50% 0.25% 0.00% 0.00%
Other Expenses (as a percentage of Assets): 0.14% 0.14% 0.14% 0.07% 0.14% 0.14% 0.14% 0.14% 0.14% 0.14% 0.07%
Expenses (as a percentage of Assets) 0.71% 1.37% 0.61% 0.44% 0.51% 0.96% 1.11% 1.01% 0.76% 0.51% 0.44%
[1]

The 12b-1 fee the Fund will pay on Class C shares will be a blended rate calculated based on (i) 1.00% of the Fund’s average daily net assets attributable to shares held for less than one year and (ii) 0.80% of the Fund’s average daily net assets attributable to shares held for one year or more. All Class C shareholders of the Fund will bear 12b-1 fees at the same rate.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Class C shares automatically convert to Class A shares after eight years. The expense example for Class C shares for the ten-year period reflects the conversion to Class A shares. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] If Shares Are Redeemed
Expense Example, With Redemption [Table]
Expense Example - Prospectus Summary - Lord Abbett Income Fund - USD ($)
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Expense Example, with Redemption, 1 Year $ 296 $ 239 $ 62 $ 45 $ 52 $ 98 $ 113 $ 103 $ 78 $ 52 $ 45
Expense Example, with Redemption, 3 Years 447 434 195 141 164 306 353 322 243 164 141
Expense Example, with Redemption, 5 Years 611 750 340 246 285 531 612 558 422 285 246
Expense Example, with Redemption, 10 Years $ 1,088 $ 1,466 $ 762 $ 555 $ 640 $ 1,178 $ 1,352 $ 1,236 $ 942 $ 640 $ 555
Expense Example, No Redemption, By Year, Caption [Text] If Shares Are Not Redeemed
Expense Example, No Redemption [Table]
Expense Example, No Redemption - Prospectus Summary - Lord Abbett Income Fund - USD ($)
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Expense Example, No Redemption, 1 Year $ 296 $ 139 $ 62 $ 45 $ 52 $ 98 $ 113 $ 103 $ 78 $ 52 $ 45
Expense Example, No Redemption, 3 Years 447 434 195 141 164 306 353 322 243 164 141
Expense Example, No Redemption, 5 Years 611 750 340 246 285 531 612 558 422 285 246
Expense Example, No Redemption, 10 Years $ 1,088 $ 1,466 $ 762 $ 555 $ 640 $ 1,178 $ 1,352 $ 1,236 $ 942 $ 640 $ 555
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block] The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 243% of the average value of its portfolio.
Portfolio Turnover, Rate 243.00%
Lord Abbett Inflation Focused Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. More information about these and other discounts is available from your financial intermediary and in “Sales Charge Reductions and Waivers” on page 292 of the prospectus, Appendix A to the prospectus, titled “Intermediary-Specific Sales Charge Reductions and Waivers,” and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 9-1 of Part II of the statement of additional information (“SAI”).
Expense Breakpoint Discounts [Text] You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds.
Expense Breakpoint, Minimum Investment Required [Amount] $ 100,000
Shareholder Fees Caption [Optional Text] Shareholder Fees (Fees paid directly from your investment)
Shareholder Fees [Table]
Shareholder Fees - Prospectus Summary - Lord Abbett Inflation Focused Fund
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) [1] 2.25% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) [1] 0.00% [2] 1.00% [3] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
[1]

A shareholder transacting in share classes without a front-end sales charge may be required to pay a commission to its financial intermediary. Please contact your financial intermediary for more information about whether such a commission may apply to your transaction.
[2]

A contingent deferred sales charge (“CDSC”) of 1.00% may be assessed on certain Class A shares purchased or acquired without a sales charge if they are redeemed before the first day of the month in which the one-year anniversary of the purchase falls.
[3]

A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase.

Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Annual Fund Operating Expenses - Prospectus Summary - Lord Abbett Inflation Focused Fund
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Management Fees (as a percentage of Assets) 0.30% 0.30% 0.30% 0.30% 0.30% 0.30% 0.30% 0.30% 0.30% 0.30%
Distribution and Service (12b-1) Fees 0.20% 0.80% [1] 0.10% 0.00% 0.00% 0.60% 0.50% 0.25% 0.00% 0.00%
Other Expenses (as a percentage of Assets): 0.24% 0.24% 0.24% 0.14% 0.24% 0.24% 0.24% 0.24% 0.24% 0.14%
Expenses (as a percentage of Assets) 0.74% 1.34% 0.64% 0.44% 0.54% 1.14% 1.04% 0.79% 0.54% 0.44%
[1]

The 12b-1 fee the Fund will pay on Class C shares will be a blended rate calculated based on (i) 1.00% of the Fund’s average daily net assets attributable to shares held for less than one year and (ii) 0.80% of the Fund’s average daily net assets attributable to shares held for one year or more. All Class C shareholders of the Fund will bear 12b-1 fees at the same rate.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Class C shares automatically convert to Class A shares after eight years. The expense example for Class C shares for the ten-year period reflects the conversion to Class A shares. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] If Shares Are Redeemed
Expense Example, With Redemption [Table]
Expense Example - Prospectus Summary - Lord Abbett Inflation Focused Fund - USD ($)
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Expense Example, with Redemption, 1 Year $ 299 $ 236 $ 65 $ 45 $ 55 $ 116 $ 106 $ 81 $ 55 $ 45
Expense Example, with Redemption, 3 Years 456 425 205 141 173 362 331 252 173 141
Expense Example, with Redemption, 5 Years 627 734 357 246 302 628 574 439 302 246
Expense Example, with Redemption, 10 Years $ 1,123 $ 1,448 $ 798 $ 555 $ 677 $ 1,386 $ 1,271 $ 978 $ 677 $ 555
Expense Example, No Redemption, By Year, Caption [Text] If Shares Are Not Redeemed
Expense Example, No Redemption [Table]
Expense Example, No Redemption - Prospectus Summary - Lord Abbett Inflation Focused Fund - USD ($)
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Expense Example, No Redemption, 1 Year $ 299 $ 136 $ 65 $ 45 $ 55 $ 116 $ 106 $ 81 $ 55 $ 45
Expense Example, No Redemption, 3 Years 456 425 205 141 173 362 331 252 173 141
Expense Example, No Redemption, 5 Years 627 734 357 246 302 628 574 439 302 246
Expense Example, No Redemption, 10 Years $ 1,123 $ 1,448 $ 798 $ 555 $ 677 $ 1,386 $ 1,271 $ 978 $ 677 $ 555
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block] The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 175% of the average value of its portfolio.
Portfolio Turnover, Rate 175.00%
Lord Abbett Short Duration Core Bond Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. More information about these and other discounts is available from your financial intermediary and in “Sales Charge Reductions and Waivers” on page 292 of the prospectus, Appendix A to the prospectus, titled “Intermediary-Specific Sales Charge Reductions and Waivers,” and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 9-1 of Part II of the statement of additional information (“SAI”).
Expense Breakpoint Discounts [Text] You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds.
Expense Breakpoint, Minimum Investment Required [Amount] $ 100,000
Shareholder Fees Caption [Optional Text] Shareholder Fees (Fees paid directly from your investment)
Shareholder Fees [Table]
Shareholder Fees - Prospectus Summary - Lord Abbett Short Duration Core Bond Fund
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) [1] 2.25% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) [1] 0.00% [2] 1.00% [3] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
[1]

A shareholder transacting in share classes without a front-end sales charge may be required to pay a commission to its financial intermediary. Please contact your financial intermediary for more information about whether such a commission may apply to your transaction.
[2]

A contingent deferred sales charge (“CDSC”) of 1.00% may be assessed on certain Class A shares purchased or acquired without a sales charge if they are redeemed before the first day of the month in which the one-year anniversary of the purchase falls.
[3]

A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase.

Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Annual Fund Operating Expenses - Prospectus Summary - Lord Abbett Short Duration Core Bond Fund
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Management Fees (as a percentage of Assets) 0.30% 0.30% 0.30% 0.30% 0.30% 0.30% 0.30% 0.30% 0.30% 0.30%
Distribution and Service (12b-1) Fees 0.20% 0.88% [1] 0.10% 0.00% 0.00% 0.60% 0.50% 0.25% 0.00% 0.00%
Other Expenses (as a percentage of Assets): 0.21% 0.21% 0.21% 0.12% 0.21% 0.21% 0.21% 0.21% 0.21% 0.12%
Expenses (as a percentage of Assets) 0.71% 1.39% 0.61% 0.42% 0.51% 1.11% 1.01% 0.76% 0.51% [2] 0.42%
Fee Waiver or Reimbursement [3] (0.11%) (0.11%) (0.11%) (0.11%) (0.11%) (0.11%) (0.11%) (0.11%) (0.11%) (0.11%)
Net Expenses (as a percentage of Assets) [3] 0.60% 1.28% 0.50% 0.31% 0.40% 1.00% 0.90% 0.65% 0.40% 0.31%
Fee Waiver or Reimbursement over Assets, Date of Termination March 31, 2027 March 31, 2027 March 31, 2027 March 31, 2027 March 31, 2027 March 31, 2027 March 31, 2027 March 31, 2027 March 31, 2027 March 31, 2027
[1]

The 12b-1 fee the Fund will pay on Class C shares will be a blended rate calculated based on (i) 1.00% of the Fund’s average daily net assets attributable to shares held for less than one year and (ii) 0.80% of the Fund’s average daily net assets attributable to shares held for one year or more. All Class C shareholders of the Fund will bear 12b-1 fees at the same rate.
[2]

These amounts have been updated from fiscal year amounts to reflect current fees and expenses.
[3]

For the period from April 1, 2026 through March 31, 2027, Lord, Abbett & Co. LLC (“Lord Abbett”) has contractually agreed to waive its fees and reimburse expenses to the extent necessary to limit total net annual operating expenses, excluding any applicable 12b-1 fees, acquired fund fees and expenses, interest-related expenses, taxes, expenses related to litigation and potential litigation, and extraordinary expenses, to an annual rate of 0.31% for each of Class F3 and R6 shares and to an annual rate of 0.40% for each other class. This agreement may be terminated only by the Fund’s Board of Trustees.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same, giving effect to the fee waiver and expense reimbursement arrangement described above. Class C shares automatically convert to Class A shares after eight years. The expense example for Class C shares for the ten-year period reflects the conversion to Class A shares. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] If Shares Are Redeemed
Expense Example, With Redemption [Table]
Expense Example - Prospectus Summary - Lord Abbett Short Duration Core Bond Fund - USD ($)
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Expense Example, with Redemption, 1 Year $ 285 $ 230 $ 51 $ 32 $ 41 $ 102 $ 92 $ 66 $ 41 $ 32
Expense Example, with Redemption, 3 Years 436 429 184 124 152 342 311 232 152 124
Expense Example, with Redemption, 5 Years 601 750 329 224 274 601 547 412 274 224
Expense Example, with Redemption, 10 Years $ 1,078 $ 1,473 $ 752 $ 519 $ 630 $ 1,342 $ 1,226 $ 932 $ 630 $ 519
Expense Example, No Redemption, By Year, Caption [Text] If Shares Are Not Redeemed
Expense Example, No Redemption [Table]
Expense Example, No Redemption - Prospectus Summary - Lord Abbett Short Duration Core Bond Fund - USD ($)
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Expense Example, No Redemption, 1 Year $ 285 $ 130 $ 51 $ 32 $ 41 $ 102 $ 92 $ 66 $ 41 $ 32
Expense Example, No Redemption, 3 Years 436 429 184 124 152 342 311 232 152 124
Expense Example, No Redemption, 5 Years 601 750 329 224 274 601 547 412 274 224
Expense Example, No Redemption, 10 Years $ 1,078 $ 1,473 $ 752 $ 519 $ 630 $ 1,342 $ 1,226 $ 932 $ 630 $ 519
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block] The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 134% of the average value of its portfolio.
Portfolio Turnover, Rate 134.00%
Lord Abbett Short Duration Core Bond Fund | Class R5 Shares  
Prospectus [Line Items]  
Expenses Restated to Reflect Current [Text] These amounts have been updated from fiscal year amounts to reflect current fees and expenses.
Lord Abbett Short Duration Income Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. More information about these and other discounts is available from your financial intermediary and in “Sales Charge Reductions and Waivers” on page 292 of the prospectus, Appendix A to the prospectus, titled “Intermediary-Specific Sales Charge Reductions and Waivers,” and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 9-1 of Part II of the statement of additional information (“SAI”).
Expense Breakpoint Discounts [Text] You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds.
Expense Breakpoint, Minimum Investment Required [Amount] $ 100,000
Shareholder Fees Caption [Optional Text] Shareholder Fees (Fees paid directly from your investment)
Shareholder Fees [Table]
Shareholder Fees - Prospectus Summary - Lord Abbett Short Duration Income Fund
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) [1] 2.25% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) [1] 0.00% [2] 1.00% [3] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
[1]

A shareholder transacting in share classes without a front-end sales charge may be required to pay a commission to its financial intermediary. Please contact your financial intermediary for more information about whether such a commission may apply to your transaction.
[2]

A contingent deferred sales charge (“CDSC”) of 1.00% may be assessed on certain Class A shares purchased or acquired without a sales charge if they are redeemed before the first day of the month in which the one-year anniversary of the purchase falls.
[3]

A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase.

Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Annual Fund Operating Expenses - Prospectus Summary - Lord Abbett Short Duration Income Fund
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Management Fees (as a percentage of Assets) 0.25% 0.25% 0.25% 0.25% 0.25% 0.25% 0.25% 0.25% 0.25% 0.25% 0.25%
Distribution and Service (12b-1) Fees 0.20% 0.83% [1] 0.10% 0.00% 0.00% 0.45% 0.60% 0.50% 0.25% 0.00% 0.00%
Other Expenses (as a percentage of Assets): 0.14% 0.14% 0.14% 0.07% 0.14% 0.14% 0.14% 0.14% 0.14% 0.14% 0.07%
Expenses (as a percentage of Assets) 0.59% 1.22% 0.49% 0.32% 0.39% 0.84% 0.99% 0.89% 0.64% 0.39% 0.32%
[1]

The 12b-1 fee the Fund will pay on Class C shares will be a blended rate calculated based on (i) 1.00% of the Fund’s average daily net assets attributable to shares held for less than one year and (ii) 0.80% of the Fund’s average daily net assets attributable to shares held for one year or more. All Class C shareholders of the Fund will bear 12b-1 fees at the same rate.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Class C shares automatically convert to Class A shares after eight years. The expense example for Class C shares for the ten-year period reflects the conversion to Class A shares. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] If Shares Are Redeemed
Expense Example, With Redemption [Table]
Expense Example - Prospectus Summary - Lord Abbett Short Duration Income Fund - USD ($)
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Expense Example, with Redemption, 1 Year $ 284 $ 224 $ 50 $ 33 $ 40 $ 86 $ 101 $ 91 $ 65 $ 40 $ 33
Expense Example, with Redemption, 3 Years 410 387 157 103 125 268 315 284 205 125 103
Expense Example, with Redemption, 5 Years 547 670 274 180 219 466 547 493 357 219 180
Expense Example, with Redemption, 10 Years $ 946 $ 1,302 $ 616 $ 406 $ 493 $ 1,037 $ 1,213 $ 1,096 $ 798 $ 493 $ 406
Expense Example, No Redemption, By Year, Caption [Text] If Shares Are Not Redeemed
Expense Example, No Redemption [Table]
Expense Example, No Redemption - Prospectus Summary - Lord Abbett Short Duration Income Fund - USD ($)
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Expense Example, No Redemption, 1 Year $ 284 $ 124 $ 50 $ 33 $ 40 $ 86 $ 101 $ 91 $ 65 $ 40 $ 33
Expense Example, No Redemption, 3 Years 410 387 157 103 125 268 315 284 205 125 103
Expense Example, No Redemption, 5 Years 547 670 274 180 219 466 547 493 357 219 180
Expense Example, No Redemption, 10 Years $ 946 $ 1,302 $ 616 $ 406 $ 493 $ 1,037 $ 1,213 $ 1,096 $ 798 $ 493 $ 406
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block] The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 161% of the average value of its portfolio.
Portfolio Turnover, Rate 161.00%
Lord Abbett Total Return Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. More information about these and other discounts is available from your financial intermediary and in “Sales Charge Reductions and Waivers” on page 292 of the prospectus, Appendix A to the prospectus, titled “Intermediary-Specific Sales Charge Reductions and Waivers,” and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 9-1 of Part II of the statement of additional information (“SAI”).
Expense Breakpoint Discounts [Text] You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds.
Expense Breakpoint, Minimum Investment Required [Amount] $ 100,000
Shareholder Fees Caption [Optional Text] Shareholder Fees (Fees paid directly from your investment)
Shareholder Fees [Table]
Shareholder Fees - Prospectus Summary - Lord Abbett Total Return Fund
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) [1] 2.25% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) [1] 0.00% [2] 1.00% [3] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
[1]

A shareholder transacting in share classes without a front-end sales charge may be required to pay a commission to its financial intermediary. Please contact your financial intermediary for more information about whether such a commission may apply to your transaction.
[2]

A contingent deferred sales charge (“CDSC”) of 1.00% may be assessed on certain Class A shares purchased or acquired without a sales charge if they are redeemed before the first day of the month in which the one-year anniversary of the purchase falls.
[3]

A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase.

Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Annual Fund Operating Expenses - Prospectus Summary - Lord Abbett Total Return Fund
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Management Fees (as a percentage of Assets) 0.28% 0.28% 0.28% 0.28% 0.28% 0.28% 0.28% 0.28% 0.28% 0.28% 0.28%
Distribution and Service (12b-1) Fees 0.20% 0.84% [1] 0.10% 0.00% 0.00% 0.45% 0.60% 0.50% 0.25% 0.00% 0.00%
Other Expenses (as a percentage of Assets): 0.17% 0.17% 0.17% 0.08% 0.17% 0.17% 0.17% 0.17% 0.17% 0.17% 0.08%
Expenses (as a percentage of Assets) 0.65% 1.29% 0.55% 0.36% 0.45% 0.90% 1.05% 0.95% 0.70% 0.45% 0.36%
Fee Waiver or Reimbursement 0.00% 0.00% 0.00% 0.00% (0.04%) [2] 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Net Expenses (as a percentage of Assets) 0.65% 1.29% 0.55% 0.36% 0.41% 0.90% 1.05% 0.95% 0.70% 0.45% 0.36%
Fee Waiver or Reimbursement over Assets, Date of Termination         March 31, 2027            
[1]

The 12b-1 fee the Fund will pay on Class C shares will be a blended rate calculated based on (i) 1.00% of the Fund’s average daily net assets attributable to shares held for less than one year and (ii) 0.80% of the Fund’s average daily net assets attributable to shares held for one year or more. All Class C shareholders of the Fund will bear 12b-1 fees at the same rate.
[2]

For the period from April 1, 2026 through March 31, 2027, Lord, Abbett & Co. LLC (“Lord Abbett”) has contractually agreed to waive the Fund’s Class I shareholder servicing expenses at the annual rate of 0.04% of the Fund’s average daily net assets. This agreement may be terminated only by the Fund’s Board of Trustees.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same, giving effect to the fee waiver and expense reimbursement arrangement described above. Class C shares automatically convert to Class A shares after eight years. The expense example for Class C shares for the ten-year period reflects the conversion to Class A shares. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] If Shares Are Redeemed
Expense Example, With Redemption [Table]
Expense Example - Prospectus Summary - Lord Abbett Total Return Fund - USD ($)
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Expense Example, with Redemption, 1 Year $ 290 $ 231 $ 56 $ 37 $ 42 $ 92 $ 107 $ 97 $ 72 $ 46 $ 37
Expense Example, with Redemption, 3 Years 428 409 176 116 140 287 334 303 224 144 116
Expense Example, with Redemption, 5 Years 579 708 307 202 248 498 579 525 390 252 202
Expense Example, with Redemption, 10 Years $ 1,017 $ 1,380 $ 689 $ 456 $ 563 $ 1,108 $ 1,283 $ 1,166 $ 871 $ 567 $ 456
Expense Example, No Redemption, By Year, Caption [Text] If Shares Are Not Redeemed
Expense Example, No Redemption [Table]
Expense Example, No Redemption - Prospectus Summary - Lord Abbett Total Return Fund - USD ($)
Class A Shares
Class C Shares
Class F Shares
Class F3 Shares
Class I Shares
Class P Shares
Class R2 Shares
Class R3 Shares
Class R4 Shares
Class R5 Shares
Class R6 Shares
Expense Example, No Redemption, 1 Year $ 290 $ 131 $ 56 $ 37 $ 42 $ 92 $ 107 $ 97 $ 72 $ 46 $ 37
Expense Example, No Redemption, 3 Years 428 409 176 116 140 287 334 303 224 144 116
Expense Example, No Redemption, 5 Years 579 708 307 202 248 498 579 525 390 252 202
Expense Example, No Redemption, 10 Years $ 1,017 $ 1,380 $ 689 $ 456 $ 563 $ 1,108 $ 1,283 $ 1,166 $ 871 $ 567 $ 456
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block] The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 429% of the average value of its portfolio.
Portfolio Turnover, Rate 429.00%
Lord Abbett Ultra Short Bond Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. Information about sales charge discounts is available from your financial intermediary and in ‘‘Sales Charge Reductions and Waivers’’ on page 40 of the prospectus, Appendix A to the prospectus, titled ‘‘Intermediary-Specific Sales Charge Reductions and Waivers,’’ and ‘‘Purchases, Redemptions, Pricing, and Payments to Dealers’’ on page 9-1 of Part II of the statement of additional information (‘‘SAI’’).
Shareholder Fees Caption [Optional Text] Shareholder Fees (Fees paid directly from your investment)
Shareholder Fees [Table]
Shareholder Fees - Prospectus Summary - Lord Abbett Ultra Short Bond Fund
Class A Shares
Class A1 Shares
Class F Shares
Class F3 Shares
Class I Shares
Class R5 Shares
Class R6 Shares
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) [1] 0.00% [2] 1.50% 0.00% 0.00% 0.00% 0.00% 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) [1] 0.00% [3] 0.50% [4] 0.00% 0.00% 0.00% 0.00% 0.00%
[1]

A shareholder transacting in share classes without a front-end sales charge may be required to pay a commission to its financial intermediary. Please contact your financial intermediary for more information about whether such a commission may apply to your transaction.
[2]

Class A shares purchased directly are not subject to any front-end sales charge. However, Class A shares initially purchased without a front-end sales charge and subsequently exchanged for shares of another Lord Abbett Fund are subject to any applicable front-end sales charge.
[3]

Class A shares purchased directly are not subject to any contingent deferred sales charge (“CDSC”). However, Class A shares of the Fund that were obtained in exchange for Class A shares of another Lord Abbett Fund that were subject to CDSC of 1.00% at the time of exchange are subject to a CDSC unless the one-year CDSC period has expired or a CDSC waiver applies.
[4]

A CDSC of 0.50% may be assessed on certain Class A1 shares purchased or acquired without a sales charge if they are redeemed before the first day of the month in which the eighteenth month anniversary of the purchase falls.
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Annual Fund Operating Expenses - Prospectus Summary - Lord Abbett Ultra Short Bond Fund
Class A Shares
Class A1 Shares
Class F Shares
Class F3 Shares
Class I Shares
Class R5 Shares
Class R6 Shares
Management Fees (as a percentage of Assets) 0.17% 0.17% 0.17% 0.17% 0.17% 0.17% 0.17%
Distribution and Service (12b-1) Fees 0.15% 0.25% 0.10% 0.00% 0.00% 0.00% 0.00%
Other Expenses (as a percentage of Assets): 0.12% 0.12% 0.12% 0.07% 0.12% 0.12% 0.07%
Expenses (as a percentage of Assets) 0.44% 0.54% 0.39% 0.24% 0.29% 0.29% 0.24%
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] If Shares Are Redeemed
Expense Example, With Redemption [Table]
Expense Example - Prospectus Summary - Lord Abbett Ultra Short Bond Fund - USD ($)
Class A Shares
Class A1 Shares
Class F Shares
Class F3 Shares
Class I Shares
Class R5 Shares
Class R6 Shares
Expense Example, with Redemption, 1 Year $ 45 $ 204 $ 40 $ 25 $ 30 $ 30 $ 25
Expense Example, with Redemption, 3 Years 141 321 125 77 93 93 77
Expense Example, with Redemption, 5 Years 246 447 219 135 163 163 135
Expense Example, with Redemption, 10 Years $ 555 $ 817 $ 493 $ 306 $ 368 $ 368 $ 306
Expense Example, No Redemption, By Year, Caption [Text] If Shares Are Not Redeemed
Expense Example, No Redemption [Table]
Expense Example, No Redemption - Prospectus Summary - Lord Abbett Ultra Short Bond Fund - USD ($)
Class A Shares
Class A1 Shares
Class F Shares
Class F3 Shares
Class I Shares
Class R5 Shares
Class R6 Shares
Expense Example, No Redemption, 1 Year $ 45 $ 204 $ 40 $ 25 $ 30 $ 30 $ 25
Expense Example, No Redemption, 3 Years 141 321 125 77 93 93 77
Expense Example, No Redemption, 5 Years 246 447 219 135 163 163 135
Expense Example, No Redemption, 10 Years $ 555 $ 817 $ 493 $ 306 $ 368 $ 368 $ 306
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block] The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance.

During the most recent fiscal year, the Fund’s portfolio turnover rate was 72% of the average value of its portfolio.
Portfolio Turnover, Rate 72.00%